Question: Lvl 40 is coming up soon, and with it Mk X gear. Should I go tricobalt torpedoes or quantum?
Personally, I don't think tricobalts are worth it. The CD is just too long, and since they're slow, it's too easy for your target to rotate and take the hit on a not-depleted shield quadrant and absorb it. You have no idea how frustrating it is to fire a 60 sec CD torpedo and either have it shot down or have it hit a shield and do basically nothing.
I actually prefer photons for most situations. Their raw damage isn't too much lower than quantums, and they have the lowest cooldown (and thus the highest DPS value). It actually does make a difference in the STFs when you're firing at a lot of high-value, unshielded targets. If I'm just fighting ships, I use plasmas. High Yield gives me all the fun of massive hits with heavy torpedoes without the absurd cooldown period of tricobalts, and unlike the near worthless plasma energy weapons, DoTs from the torpedoes stack. They also bypass shields, and benefit from the disruptor debuff if I happen to be using my disruptor beams.